Electrical transformer.



R. F. AGNEW.

ELECTRICAL TRANSFORMER.

APPLICATION FILED MAR- 3,1909.

Patented Nov. 16,1915.

UNITED STATES PATENT OFFICE.

RAY F. -AGNEW, 0F CLEVELAND. OHIO, ASSIGNOR TO AGNEW ELECTRICWELDING COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ELECTRICAL TRANSFORMER.

Specification of Letters Patent.

Patented Nov. 16, 1915.

Application filed March 3, 1909. Serial No. 481,172.

principle of the invention being herein ex-v plained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to electrical transformers, .and particularlyto that class of transformers designed to furnish, currents of large volume such as are required for heat-1' ing and working metals.

In the usual types of transformers de-- signed for the purpose mentioned, it is impossible to'dispose of the turns of the secondary in a manner such as to intersect and occupy more than a comparatlvely small .portion of the magnetic field of the primary coil, unless such secondary be a cast metal structure. Inasmuch as-such cast metal is of aconductivity only about one-half that of wrought metal, and inasmuch as the absence of the laminated structure in such cast metal construction makes it practically impossible to obtain the cooling surface required in order to obtain the most efficient and economical results, it has been usually foundinexpedient to employ such cast metal structures in devices of this character. Wrought fmetal laminated structures are therefore generally used, notwithstanding that the same occupy, as before indicated, only a comparatively small portion of the magnetic field of the primary coil, and notwithstanding the consequent loss of current resulting therefrom and the decrease in the efiiciency arising out of such loss.

The object of my invention is to combine the advantages ofa cast metal construction in so far as pertains to occupying the greatest possible part of the magnetic field, with the advantages of a laminated wrought metal construction, in so far as pertains to the latter.s increased conductivity and the pres-' ence therein of a large cooling surface to avoid excessive heating; and at the same time provide for convenient attachment of,

the carriages or workholders of welding machines to the terminals of the. secondary so as to permit of the required range of movement of such carriages or workholders. My said object, in addition to the provision of the characteristics above mentioned, also invention taken upon a plane passing through the axis of the core, and showing the secondary in elevation. Fig. 2 is an elevation of such transformer as viewed from the direction indicated by the arrow in Fig; 1. Fig. 3 is a plan of such transformer. Fig. 4

-is a detail perspective of one of the strips or ribbons of conducting material which go to make up the secondaryof the transformer.

Referring to the drawing, A is a hollow core constructed in the usual manner, of fiat plates of iron or steel, piled upon each otherand suitably'secured to form the usual laminated structure required. Disposed at opposite sides of and surrounding said core are two primary coils B and B, whose ends I) I) b are preferably located in the same planes respectively, These coils are connected with each other in series, as shown in the drawing, or they may be connected in the circuit in multiple, as will be readily understood.

Located in the magnetic field of the primary coils is the secondary C. This secondary is a laminated conductor consisting of a plurality of thin fiat strips or ribbons of metal, usually copper, which are continuoils and unbroken from one terminal 0 to the other terminal 0. These strips or riband 0 at opposite ends of the coils joined at the top by a bridge portion, (0 0"). The said turns are opposite the ends]; I) of the primary coils and the strips or 'ribbonsa're placed so that theirfaces lie-in planes parallel with the direction of such turns and parallel with the ends of the coils B B, said 5 turns being thereby placed edgewise around To obtain this construction with allel-with the one face 6 of the one. coil B andalong its entiredepth. It is then folded passes along the entire width of the coil, as shown. It is then again foldedor doubled ,upon itself and passes upwardly on theiouts- "side of the core and parallel with the same coil end. One turn is thus formed. 1 The material then doublesupon itself at right.

angles as shown in Fig. 3 and then passes along. parallel-with the upper side of the coil to form the bridge portion 0. From thence, it again doubles and passes over to the opposite end 6 andon the inside of the core downwardlyalong and parallel with '25 said end. At the lower part of this end of the core parallel-with this coil end, thus completing a second turn. It now turns at right angles and passes over to apoint opposite the end I of the other rimary coil B. .Passing downwardl insi e the core along and parallel with thls coil end it turns and passes beneath the core to the outside thereof, up-

' wardly to form a third turn, along the upperside of the coil to form the bridge portion 0", then over to the opposite end I)" of 40 the coil downwardly along and parallel with such endfacrossand beneath the core, then 4 upwardly parallel with and along the same coil end to complete the fourth turn, the upper portion of this last part of the secondary .45 forming the terminal 0. This terminal portion is bent at right angles and then upon itselfand again at right anglesso that its facesoccupy planes lying at right angles with respect to the planes in which the faces 4 of the terminal portions 0 are located.

The terminals are secured in any suitable and well known manner to the carriages or workholders. By constructing the terminal portions as above described, it will be noted that each is flexible in one direction only.

and that these directions are'different from each other, and as shown, at right angles relatively to each other. By these means, the onecarriage or.workholder may be adv justable or. movable in one direction,- and the other carriage or workholder may be adjustable or movable in a direction at right angles to the direction of movement of the first named carriage.

- Having fully described my invention, what core. v 4:."In a transformer, the combination with I claim and desire to secure by Letter Pat ent is:

v ,1. In a transformer, the combination with a core and primary windings, of asecondary including a turn composed of a' laminated conductor, consisting of a plurality of flat strips edgewise wound about the core for the major portion of the turn, the flat faces of the strips being arrangedin planesparallel to the plane of the direction of the primary --winding. or doubled at right angles upon itself and 2. In a transformer, the combination with a core and pr mary wmdlngs, ofa secondary including a plurality of turns each composed .of a laminated conductor consisting of fiat strips or ribbons edgewise Wound about the core: for the major portion of the turn, the

flat ,faces'of the strips being arranged in I planes parallel to the plane of the direction of the primary winding.

- 3. In a'transformer the combination with a coreand a primary coil, of a secondary consisting of a laminated metal structure formed of a plurality of flat strips or ribbons arranged in turns around the core, the flat faces of the major portions of such turns being arranged in planes transverse tothe a co' re and a primary'coil, of a secondary consisting of a plurality of flat metal strips folded at right angles to form turns, the

strips being edgewise wound around the core for the major portion of the turnand having a section formed at an angle to the edge wound portionsto connect the turns-in electrical series.

5. In a transformer, the combination of twoprim'ary coils, a suitable core lylng in the field of such coils; anda secondary composed of two connected parts and comprising a. plur'alityof flat strips or ribbons of conducting material, each strip beingcontinuous and unbroken and forming part of each secondary coil; each part of the secondary including turns whose faces are in planes parallel with the plane ofthe direction of the primary windings.

6. In a transformer, the combination with a core and the primary windings, of a secondary comprising two parts each divided into two sections, each section being opposite oneof the two opposite ends of the primary coil, and each having a turn consisting of a plurality of flat strips or ribbons of conducting material whose faces lie in planes parallel with the side'edges of said primary coil. I f 1 a 7. In a transformer, the. combination with acore and a primary coil, of a secondary coil comprised of a flat strip or ribbon, having straight portions at opposite sides of the core, respectively parallel and adjacent I to. opposite sides of the primary coil, and a straight portion c'onnecting the same parallel and adjacent to a face of the primary coil which is transverse with said sides thereof,

8. In a transformer, the combination with a core and a primary winding, of a secondary consisting of a comparatively thin wide flat strip of bendable material, the flat faces of the major portion of the strip being parallel and adjacent to those faces of-the primary coil which are transverse to the core.

'9. In a transformer, the combination with a core and primary windings; of a secondary, consisting of a comparatively thin wide flat strip of bendable material having portions positioned-upon opposite sides of said primary windings, with the fiat faces of the strip parallel to the plane of the direction of the primary windings, and a connection between the portions of the strip lpon opposite sides'of said primary windings. i

10. In a transformer, the combination with the core and p mary windings; of a secondary, consisting, of U-shaped members positioned upon opposite sides of said primary windings, each of said members being formed of a comparatively thin Wide flat strip of bendable material, having the flat faces parallel to the plane of the direction of said primary windings, and a connection between said U-shaped members.

11. In a transformer, the combination with acore and a primary coil, of a secondary coil comprised of .a flat strip or ribbon having straight portions at opposite sides of the'core, and a straight portion connecting the same, the three said portions being parallel and adjacent to the same face of the primary coil.

Signed by me, this 1st day of March, 1909.

RAY F. AGNEW. Attested by- WILLIAM RosE MILLER, A. E. MERKEL. 

